Getting to -0 in RC?

I'm looking for advice/resources for getting to -0 in the RC Section. I'm very consistently getting -3 on RC sections and am typically missing the "curve-breaker" questions. I usually finish all the questions but don't have time to go back and review the harder questions. What's the best way to drill these harder RC questions? Do I need to just improve my speed on easier questions?

Thanks in advance for any advice!